Cannot Complete Certificate Renewal on Exchange 2013

So I have went through the process of renewing my Standard UCC SSL Certificate on my Exchange 2013 server including submitting the CSR to GoDaddy, downloading the finished cert, installing the intermediate certs (again) but it falls apart when I click "Complete". I input the UNC path to the cert, click ok, the window processes for a moment then takes me right back to the "Certificates" page in 2013 and that's IF it doesn't give me this error message: A special Rpc error occurs on server EXCH2013HYBRID: Cannot import certificate. A certificate with the thumbprint 155D2A21D13363B7BB0EC03E2B236CB913E6163F already exists.A special Rpc error occurs on server EXCH2013HYBRID: Cannot import certificate. A certificate with the thumbprint 155D2A21D13363B7BB0EC03E2B236CB913E6163F already exists.. The new and old certs are in the "Certificates" snap-in under "Personal" however the new cert doesn't have the message "You have a private key that corresponds to this certificate". When I check the event log I see eventID 6 in the MSExchange Management log which states Cmdlet failed. Cmdlet Import-ExchangeCertificate, paramenters -PRivateKeyExportable "True" -FileName "\\server\\folder\mynewcert.crt" -Server "". Can anyone tell me what I am doing wrong or missing please??

The server exists in a hybrid format with Office 365 running on Version 15.0 (Build 1044.25) on Windows Server 2012 R2 Standard which is fully updated.
Todd WilloughbyLead System EngineerAsked:
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Have you tried to create a new request and complete the request at IIS with the new certificate you already got from godaddy (instead at Exchange console)? If I recall correctly I had sometime similar problem at renewing the certificate and using the IIS I was able to get new certificate with the private key.
Then when you install it in the personal store on the exchange server you should see it in exchange console and you should be able to set to needed services.
Todd WilloughbyLead System EngineerAuthor Commented:
I get the following error message from GoDaddy when I attempt to do what you suggested "You entered an invalid CSR. Please try again. I also noticed that the CSR contained a LOT more characters that the one I pulled from Exchange 2013.
Todd WilloughbyLead System EngineerAuthor Commented:
Ok so I logged into Exchange 2013, went to servers, certificates, selected the certificate I wanted to renew, used the CSR to rekey my cert in GoDaddy, waited for that to validate, downloaded the validated cert, converted it into a Base-64 encoded X.509 (.CER) by using these instructions , click "complete" then finished out the process. It seems to have renewed correctly this time. Thanks for your help davorin.

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I'm glad you have solved your problem.
Todd WilloughbyLead System EngineerAuthor Commented:
I accepted my own solution because it was the one that worked.
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